Interacoustics AS608 Operation Manual page 13

Auto Threshold:
In addition to traditional manual testing, the AS608e incorporates a
Hughson Westlake patient controlled automatic threshold test
complying with ISO 8253. When the test is completed the results are
easily recalled from the internal memory of the AS608e and
transferred to the Diagnostic Suite PC software and stored in
TM
OtoAccess or Noah.
Hughson Westlake is an automatic pure tone test procedure.
Threshold is defined as 2 out of 3 (or 3 out of 5) correct responses
at a certain level in a 5 dB increase and 10 dB decrease test
procedure. The Hughson Westlake is used to obtain pure tone
thresholds automatically.
Talk Forward
The Talk Forward function makes the AS608e easy to work with
particularly in sound booth installations.
AS608/AS608e Operation Manual Page9